Read USB device configurations from index 0.

device/usb/usb_descriptors.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/usb/usb_descriptors.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 131 matching lines @@
     callback.Run(std::move(desc));
     return;
   }
 
   uint8_t num_configurations = desc->num_configurations;
   UsbDeviceDescriptor* desc_ptr = desc.get();
   base::Closure closure = base::BarrierClosure(
       num_configurations,
       base::Bind(OnDoneReadingConfigDescriptors, device_handle,
                  base::Passed(&desc), callback));
-  for (uint8_t i = 1; i <= num_configurations; ++i) {
+  for (uint8_t i = 0; i < num_configurations; ++i) {
     scoped_refptr<IOBufferWithSize> header = new IOBufferWithSize(4);
     device_handle->ControlTransfer(
         USB_DIRECTION_INBOUND, UsbDeviceHandle::STANDARD,
         UsbDeviceHandle::DEVICE, kGetDescriptorRequest,
         kConfigurationDescriptorType << 8 | i, 0, header, header->size(),
         kControlTransferTimeout,
         base::Bind(&OnReadConfigDescriptorHeader, device_handle, desc_ptr, i,
                    closure));
   }
 }
@@ skipping 355 matching lines @@
     callback.Run(std::move(index_map));
     return;
   }
 
   ReadStringDescriptor(device_handle, 0, 0,
                        base::Bind(&OnReadLanguageIds, device_handle,
                                   base::Passed(&index_map), callback));
 }
 
 }  // namespace device